C1541

POWER STEERING: ELECTRONIC POWER STEERING SYSTEM: C1541: Vehicle Speed Signal Malfunction

DTC C1541 - Vehicle Speed Signal Malfunction

DESCRIPTION

The power steering ECU receives vehicle speed signals from the skid control ECU via CAN communication. The ECU provides appropriate assisting force in accordance with the vehicle speed, based on the signals.
If the ECU detects this DTC, it adjusts the amount of power assistance for a speed of 100 km/h (62 mph) and continues the system control.






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK OTHER DTC OUTPUT
(a) Check if DTC U0073 or U0129 is output.
Result:





HINT:
- DTC U0073 indicates a CAN communication malfunction in the electronic power steering system.
- DTC U0129 indicates a ABS ECU communication malfunction in the electronic power steering system.

B -- REPAIR CIRCUIT INDICATED BY OUTPUT CODE
A -- Continue to next step.
2. CHECK OTHER DTC OUTPUT
(a) Check for DTCs of the ABS system.
Result:





HINT: These DTCs indicate a speed sensor signal malfunction in the ABS system.
NOTE: If replacing the power steering ECU, initialize the rotation angle sensor and calibrate the torque sensor zero point Electronic Power Steering System.

B -- REPAIR CIRCUIT INDICATED BY OUTPUT CODE
A -- REPLACE POWER STEERING ECU